CFR > Title 23 - Highways > CHAPTER I—FEDERAL HIGHWAY ADMINISTRATION, DEPARTMENT OF TRANSPORTATION > SUBCHAPTER G—ENGINEERING AND TRAFFIC OPERATIONS (parts 620 to 669) > PART 636—DESIGN-BUILD CONTRACTING > SUBPART D—Exchanges (§636.401 to §636.409) > 636.406—Are communications allowed prior to establishing the competitive range?